Hi all,
The term "White Tin"; are you referring to flat solderable tin such as that
offered by Dexter?  If so, Praegitzer has it available in the White City
facility and is getting a favorable response as well.

Rodney

> -----Original Message-----
> From: Luther, Brandon [SMTP:[log in to unmask]]
> Sent: Tuesday, July 13, 1999 2:05 PM
> To:   [log in to unmask]
> Subject:      Re: [DC]
>
> Joe,
>   Dataram switched from HASL to immersion white tin about 6 months ago.
> We assemble our own products that consist of 99 44/100% SMT.
>   The main reason for the switch was the flatness of the solder pads and
> the overall board.  We were experiencing pins that were not soldered to
> the board.  It was determined that the HASL was not level and that some
> pins were not touching the solder paste.
>   The white tin has worked very well for us.  There wasn't any increase
> in the cost per board, but, not every fab house can do white tin.  The
> solderability is just as good as HASL, and the shelf life is also
> comparable.
>   Overall we are very pleased with it.
>
>    Regards,
>         Brandon Luther
>
>
> -----Original Message-----
> From:   Joe Reichert [mailto:[log in to unmask]]
> Sent:   Tuesday, July 13, 1999 2:27 PM
> To:     [log in to unmask]
> Subject:        [DC]
>
> I sent this to TechNet, but I thought someone here
> might have a comment too.
>
> Our PCB house requested that we specify using a
> White Tin coating over copper for improved solderability.
> Has anyone had any experience with this before?
> Solderability, Cost, Oxidation, etc...?
> Thanks in advance,
>
> Joe
>
>
> All views and opinions expressed are my own and may
> not represent the views and opinions of my employer.
> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> :::
> Joe Reichert
> mailto:[log in to unmask]
>
> NorthStar Technologies, Inc.
> A Lake Shore Company
> 575 McCorkle Boulevard
> Westerville, Ohio 43082
> Voice: 614-818-1150 Ext. 238
> Fax: 614-818-1605
> http://www.northstar-tec.com